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Revenue Recognition - Schedule of Revenue Disaggregated by Line of Business (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Guarantee period |  |  | 90 days |
Net service revenues | $ 1,552,132 | $ 1,466,226 | $ 4,537,047 | $ 4,318,613
Accountemps |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net service revenues | 489,690 | 479,415 | 1,460,155 | 1,431,567
OfficeTeam |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net service revenues | 265,941 | 265,235 | 779,010 | 794,749
Robert Half Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net service revenues | 185,268 | 176,552 | 536,571 | 508,060
Robert Half Management Resources |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net service revenues | 177,562 | 162,564 | 530,064 | 503,652
Temporary and consulting staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net service revenues | 1,118,461 | 1,083,766 | 3,305,800 | 3,238,028
Permanent placement staffing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net service revenues | 134,582 | 129,667 | 407,038 | 386,105
Risk consulting and internal audit services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net service revenues | $ 299,089 | $ 252,793 | $ 824,209 | $ 694,480

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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